<template>
  <view class="cart-container" v-if="cartItems.length > 0">
    <MyAddress></MyAddress>
    <!-- 购物车商品列表的标题区域 -->
    <view class="cart-title">
      <!-- 左侧的图标 -->
      <uni-icons type="shop" size="18"></uni-icons>

      <!-- 描述文本 -->
      <text class="cart-title-text">购物车</text>
    </view>
    <!-- 商品列表区域 -->
    <uni-swipe-action>
      <block v-for="(product, index) in cartItems" :key="index">
        <uni-swipe-action-item
          :right-options="swipeOptions"
          @click="swipeActionClickHandler(product)"
        >
          <view class="goods-item">
            <!-- 商品左侧图片区域 -->
            <view class="goods-item-left">
              <radio
                :checked="product.goods_state"
                @click="radioChangeHandler(product)"
                color="#C00000"
              ></radio>
              <image
                :src="product.goods_small_logo || defaultImage"
                class="goods-pic"
              ></image>
            </view>

            <!-- 商品右侧信息区域 -->
            <view class="goods-item-right">
              <!-- 商品标题 -->
              <view class="goods-name">{{ product.goods_name }}</view>
              <view class="goods-info-box">
                <!-- 商品价格 -->
                <view class="goods-price">
                  ￥{{ product.goods_price | formatNum }}
                </view>
                <!-- 商品数量 -->
                <uni-number-box
                  :min="1"
                  :value="product.goods_count"
                  @change="changeCount(product, $event)"
                ></uni-number-box>
              </view>
            </view>
          </view>
        </uni-swipe-action-item>
      </block>
    </uni-swipe-action>
    <!-- 结算区域 -->
    <MyCheckout></MyCheckout>
  </view>
  <!-- 购物车无商品时 -->
  <view class="empty-cart" v-else>
    <text class="tip-text">空空如也~</text>
  </view>
</template>

<script>
import { mapState } from 'vuex'
import badge from '@/mixins/badge.js' // 代码混入
import MyAddress from '@/components/my-address'
import MyCheckout from '@/components/my-checkout'
export default {
  mixins: [badge],
  components: {
    MyAddress,
    MyCheckout
  },
  data() {
    return {
      defaultImage:
        'https://img3.doubanio.com/f/movie/8dd0c794499fe925ae2ae89ee30cd225750457b4/pics/movie/celebrity-default-medium.png',
      swipeOptions: [
        {
          text: '删除', // 显示的按钮文本
          style: {
            backgroundColor: '#C00000' // 按钮的背景颜色
          }
        }
      ]
    }
  },
  onShow() {
    // 重新更新角标 - 因为immediate只会在页面加载完成之后执行一次
    if (this.total > 0) {
      uni.setTabBarBadge({
        index: 2,
        text: '' + this.total
      })
    }
  },
  computed: {
    ...mapState('cart', ['cartItems'])
  },
  methods: {
    // 购物车商品删除事件
    swipeActionClickHandler(item) {
      this.$store.commit('cart/removeGoods', item)
    },
    // 修改购物车商品数量
    changeCount(product, e) {
      this.$store.commit('cart/updateCount', { product, num: e })
    },
    // 修改购物车选中状态
    radioChangeHandler(item) {
      this.$store.commit('cart/updateState', item)
    }
  }
}
</script>

<style lang="scss" scoped>
.goods-item {
  display: flex;
  padding: 20rpx 10rpx;
  border-bottom: 1rpx solid #f0f0f0;
  width: 750rpx;
  box-sizing: border-box;

  .goods-item-left {
    margin-right: 10rpx;
    display: flex;
    justify-content: space-between;
    align-items: center;

    .goods-pic {
      width: 200rpx;
      height: 200rpx;
      display: block;
    }
  }

  .goods-item-right {
    display: flex;
    flex-direction: column;
    justify-content: space-between;

    .goods-name {
      font-size: 26rpx;
    }

    .goods-price {
      font-size: 32rpx;
      color: #c00000;
    }
  }
}
.cart-title {
  height: 80rpx;
  display: flex;
  align-items: center;
  font-size: 28rpx;
  padding-left: 10rpx;
  border-bottom: 1rpx solid #efefef;
  .cart-title-text {
    margin-left: 20rpx;
  }
}
.cart-container {
  padding-bottom: 100rpx;
}
.empty-cart {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 300rpx;

  .tip-text {
    font-size: 24rpx;
    color: gray;
    margin-top: 30rpx;
  }
}
</style>
